WILSONVILLE, Ore. (KOIN 6) — A phone system outage is preventing approximately 400 Wilsonville residents, who are customers of Frontier Communications, from being able to make 911 calls to the Clackamas County Communications Center (C-COM), a Clackamas County official confirmed.

Frontier Communications Public Relations and Marketing Manager Emily Tantare said the outage has been isolated to a problematic transport system between Somerset and Wilsonville.

Tantare said crews are at the site and expect to have service restored by 5 p.m.

Clackamas County Public Affairs Manager Tim Heider said emergency calls to 911 placed from cell phones are still operational.

C-COM answers emergency calls for all areas of Clackamas County except the cities of Lake Oswego, West Linn and Milwaukie.

There is currently no estimate to when non-emergency phone service will be restored.

KOIN 6 News will continue to follow this developing story and provide updates as they become available.